Molecular dynamics simulation study of the chemical structure-density relationships for suspended oil

Suspended oil, a critical component of liquid floated gyroscopes, experiences localized density variations due to uneven temperature distribution in the working environment, leading to disturbing torque. This study employed molecular dynamics simulations to investigate the effects of varying molecular weight, polymer dispersity index (PDI), and temperature on the density of fluorinated ether polymers. Multiple density simulation models of fluorinated ether polymers with varying molecular weights were successfully constructed and analyzed at different temperatures. The experimental data showed that the density of fluorinated ether polymers increases linearly with molecular weight. Additionally, the density of fluorinated ether polymers decreases with increasing temperature, and their density becomes less temperature-sensitive with increasing molecular weight. Fluorinated ether polymers with low PDI show smaller density variations with temperature changes, confirming their stronger resistance to temperature fluctuations. This study provides theoretical foundations and data support for the development of future applications of suspended oil.